Texas Veteran Certified BusinessTexas VetHUB Vendor
FIPS 204 hybrid digital signatures, HashSign AI pre-sign checks, and Hedera ledger consensus proofs for local, state, and federal agencies.
Company data
HashSign is a product of Exemplar Copy LLC, a Texas veteran certified business and Texas Certified VetHUB vendor. CAGE and UEI will replace the pending markers as soon as SAM.gov registration is issued.
Agency demos: ceo@exemplarcopy.com · support@hashsign.app
Business type
Texas Veteran Certified Business / VetHUB
CAGE code
Pending
Unique Entity ID (UEI)
Pending
Deployment posture
Cloud, hybrid, or enclave
Core capabilities
NIST-standardized quantum resistance combined with classical ECDSA P-256 for backward compatibility. A signing request can return both envelopes, and Hedera stores a SHA-384 (96 hex characters) hybrid anchor of the pair so the consensus message stays inside the HCS size limit.
Tamper-evident consensus anchoring that records a SHA-384 seal (96 hex characters) at a consensus timestamp. Raw payloads stay off the ledger. Verify returns the transaction id and consensus time anyone can recompute. A hash shows a document has not changed since it was sealed. It does not prove who signed it.
Automated contract anomaly detection before a signature is issued, plus agent key scope enforcement and tamper-evident event logging. Agents authenticate with scoped API keys. They never hold signing keys.
The document stays on the device until the user sends or shares it. Only the SHA-384 seal (96 hex characters) is anchored. Optional cloud review runs only when the user taps it. Deployment can be commercial cloud, a hybrid network, or a government enclave.
Security posture
HashSign is built so a contracting office can map the product to published standards without treating a marketing claim as an authorization. FIPS 204 readiness is the ML-DSA-65 hybrid envelope. It is not a claim of a completed CMVP certificate.
Signing keys stay isolated from agent credentials and from operator consoles.
NIST FIPS 204
Module-Lattice-Based Digital Signature Standard (ML-DSA).
NIST SP 800-208
Recommendation for Stateful Hash-Based Signature Schemes, cited for PQC migration planning. HashSign's hybrid envelope implements ML-DSA under FIPS 204, not LMS or XMSS.
Texas DIR & HUB
Texas Certified VetHUB vendor, aligned to state procurement and Historically Underutilized Business programs.
Zero-trust architecture
Key isolation and server-side operator separation. Scoped agent credentials, audit logs on every sign request.
Download the one-page capability statement or write ceo@exemplarcopy.com and support@hashsign.app. Include your agency, the workflow you need signed, and whether the deployment is cloud, hybrid, or enclave.
